Spark-plug.



R. COLIN. SPARK PLUG.

APPLICATION FILED NOV. I, 1915.

@tent-d Nov. 28. IMIS,

" dent of Strassburg, Alsace, Germany, have REIN CLIN, OFSTRASSBUBG, GERMANY.

SPARK-PLUG.

Specification of Letters Patent.

Patented Nov. v28, 1916.

Application led November 1, 1915. Serial No. 59,116.

7 '0 all whom it may concern.

Be it known that I, REN COLIN, a subject of the Emperor of Germany, and resiinvented certain new and useful Improvements in Spark-Plugs, of which the following is a complete specification.

My invention relates to a sparking plug which can be inserted in a simple manner and is effectively secured against unintentional displacement during operation. The casing of the plug may be rigidly secured in the motor cylinder or may be made integral therewith, because the casing may be left in position vwhen the plug is taken out. The securing of the plug in a gas-tight manner is effected by means of a groove cam whichv engages with and presses down shoulders on the plug. By the pressure thus exerted the plug is retained in such a firm manner that Vit cannot be forced out of place even lby the heaviest shocks of the motor, as the pres-A sure acting upon the plug presses the shoulders tightly in the groove in the casing. In order to prevent any unintentional movement or loosening of the plug, a locking device is also provided.

An example of construction according to the invention is illustrated in the accompanying drawing.'

Figure l shows a section ofthe sparking plug; Fig. 2 shows av section of the casing thereof; Fig. 3 shows a Aplan View; Fig. 4 shows a section of the shell of the plug; Fig. 5 shows the current-carrying pin; Fig. 6 shows a front view ofthe sparking plug; Fig. 7 is a section on line A-B of the Fig. l.

The casing a according to the presentpeX- ample of construction, is screwed tightly into the motor cylinder by a screw thread at b. As hereinbefore stated, this casing may be cast in one with the cylinder, or it may be secured thereto in a permanent manner.

' This shell'c is Aprovided with projecting lugs or shoulders f and possesses a perforated bottom a', in the middle hole ofV which lies the end of the pin a. The casing a is .also provided with groove cams L which are formed on the under surface of the inwardly turned fiange z'. Slots at g extend through' this fiange and thus permit the `shoulders f to enter the cam grooves and to be turned to a holding position therein.

The` shell e is provided with an internal shoulder or fia-nge 7c forming the seating of aninsulator Z which is packed by a packing ring m. A screwplug or nut w screwing into the top s of shell e locks the insulator Z therein. The ignition pin n is packed in turn inthe insulator Z by means of a ring o placed in a recess in the insulator, against' which ring an enlargement at ron the pin is drawn by means of nuts 79, which cannot become loose as they are locked in position by the springy expanding end g ofthe pin n.

' The internally screwed top portion s of the shell e also carries a handle t which is retained in position by a spring pawl u adapted to engage between projections fu on the casing a., and thus to preventI unintentional turning of the shell e in the casing.

Having thus described my invention and in what manner the same is to be performed I declare that what Iclaim'is:

A spark plug of the.character described comprising in combination, an outer casing, projections on said casing, an inner shell within said casing having a perforated bottom, projecting lugs on said shell, and cam grooves in said outer casing adaptedto re-` ceive said projections for 4locking said casing and shell, an inner fiange on said shell, an insulator seated upon said flange, a plug screwed into the top of said shell for locking the insulator in its position in said shell,

an ignition pin in said insulator extending through the central hole of said perforated bottom, means for securing said pinin its position, a handle secured in the top portion of said shell, and a spring pawl adapted to engage between the projections on said casing for preventing an accidental rotation of the shell.

In testimony whereof I affix my signature.

REN comu.. 

